*Added by me.
Action—>Consequence. There are instances in which we know doing A will cause B. The Bible teaches us that having anger in our hearts will result in enemies. It is also my belief that this verse refers to a lashing tongue, someone who does not think before they speak and someone who has hardened their heart against others and sees only their way. Our words are the only way others can know our hearts, and they will remember if our words were tender and loving, or short and hurtful.